As it happens, the same satellite that scans for fires also provided the basemap image. I heart NASA.
Anyways, each dot represents a moment of pretty extreme heat, down to the one square kilometer level (I only retained fires greater than 100
There are a couple temporal charts in there, too. The seasonal curve I would expect, but the overall upwards trend was interesting (and 2012 is only half through). Is it related to a lag-offset El Niño or La Niña effect?
It's almost like the universe balancing itself out, considering the general density of historical tornadoes. Except poor Florida gets a heaping pile of both. Can there be a fire tornado? If so, look out, Tampa. Also, what's cooking in the south Mississippi basin? And check out the firewall of the Cascades -You shall not pass!
Here's an animated version of this map, isolating each year's fires and highlighting their aggregated intensities on the chart.